Problems must be clearly and unambiguously formulated and provided together
with at least one solution. We will not have time to solve all proposed
problems ourselves. We prefer to get your proposals in English. Each participating country is expected to propose 1–2
problems in each of the following standard categories: algebra, combinatorics,
geometry, number theory. The problems should be of different difficulty, not
exceeding that of the medium problems of the IMO (but being easier than the
easy problems of the IMO is okay). Proposed problems must be original, i.e.,
never occurred in any competitions and not available in any mathematical books
or other sources. In particular, problems proposed to earlier BW competitions
are not acceptable.

Information about participants must include name and gender of all
contestants and leaders (and observers if any). Please include all specific
requirements that the organizers should know (e.g., dietary restrictions) if
anyone in your team has any. It is important for booking a min-cost set of
hotel rooms that we know the names and genders two weeks before the event at
latest. If you do not know all details by the deadline, we kindly ask to
provide us the partial information that you have by that moment.

The travel details should include the expected time and place of your
arrival to Tartu (Tartu airport, coach station or train station) and the time
and place of your departure from Tartu. We do not need to know the time of
your arrival to or departure from Tallinn airport since nobody will meet you
there. Just bear in mind that Tallinn airport is not that small as yet ten
years ago; it is recommended that passengers come to check-in at least two
hours before departure if it takes place during busy hours (in practice
however, arriving just 1 hour before departure is usually enough).